Ivivi Technologies, Inc. is a medical technology company focusing on designing, developing and commercializing its proprietary electrotherapeutic technology platform, with a primary focus on developing treatments for cardiovascular disease.

However a cursory glance through provides the following statement: "in 1855 Guillaume Duchenne, the father of electrotherapy, pronounced Faradic (AC) current superior to Galvanic (DC) current for electrotherapeutic purposes."—so I’m inclined to think that the early researchers were playing with both AC and DC in the lab, regardless of which was first used for commercial purposes.